How to choose an electric wire
How to choose an electric wire
Numerous household appliances andPower tools are connected to the home electrical system, and a significant load is placed on the wiring. In order for the electrician to withstand loads and has served more than one decade, it is important to choose the correct cable for the electrical wiring.
Instructions
1
Making a choice between aluminum and copperwires, consider the fact that the first are cheaper, but slightly inferior to the latter in terms of performance. Aluminum wiring has less strength and electrical conductivity, crumbles faster than an analog of copper, oxidizes, interacting with air. Copper wires are more durable, durable and reliable.
2
When choosing a wire, pay attention to thischaracteristic, as the cross-sectional area. From this index depends the ability of the wire to withstand a certain load. Choose wiring with a cross section of 6; 4; 2.5; 1.5; 1; 0.75 mm. If you still prefer an aluminum wire that has low conductivity, buy one with a cross sectional index higher by one than that of a copper analog.
3
Buying a cable for a dwelling,be guided by special wires of the following types: PVS, VVG, VVG marked "NG" and NYM. The connecting cable of PVS type consists of copper strands twisted together and protected from the outside by a PVC sheath. Its main positive quality is fire resistance, that is, the lack of ability to spread combustion in a single laying. Wire ПВС is used in repair of premises, for connection of electric tools and devices. In the conditions of proper operation, this cable will last at least 10 years.
4
A powerful VVG cable is capable of withstanding the voltagein the range from 0.66 to 1 kV. When operating this type of wiring, ambient temperature fluctuations from "minus" to "plus" of fifty degrees are permissible. The core of the cable can be made of both aluminum and copper. Sheath and insulation - from PVC. When laying an VVG cable, it should be noted that the bend radius should not be less than six diameters of cross sections. The VVG wire marked "NG" has non-combustible materials in the envelope, which allows it to be used successfully with increasing the level of electrical safety of the facility.
5
A robust NYM cable is provided with an interlayerchalk-rubber insulation, which reduces the risk of its damage when working in non-standard conditions. To increase electrical safety, the cable is provided with an outer sheath made of plastic. The NYM wire is successfully used to create a network of electrical wiring inside the dwelling. But for wiring on the street and laying in damp concrete this type is not suitable.
